Japanese

RESEARCH CONTENT

Study on interaction between soil and structure

All civil structures are built on the ground. Therefore, when designing and constructing a civil structure, it is important how to evaluate the soil-structure interaction. The soil-structure interaction depends on the various factors, such as both rigid difference, nonlinearity, and the characteristics of external force. Accordingly, in order to comprehend these factors correctly, it is necessary to solve the mechanical behavior of soil and structures by sophisticated experiments and numerical analysis.
In recent years, furthermore, the design of civil structures has been made the shift to the performance based design from the specification based design, so we need to investigate not only the deformation and the damage but also the demand performance and the marginal state of structures. Based on the above-mentioned subject, we are carrying out research for various civil structures, such as a group pile foundation, a culvert tunnel, and a reinforced earth through the many experiments and numerical analysis to elucidate the soil-structures interaction and construct the rational design approach.

Investigation of seismic performance in culvert longitudinal direction of precast arch culverts	Elucidation of seismic reinforcement mechanism of reinforced earth wall Elucidation of reinforced earth wall seismic behavior with respect to reinforcement laying region
Verification of usefulness of numerical analysis by three-dimensional finite element method for the composite pile method	Lateral resistance characteristics of steel pipe sheet pile foundation by simulating the joint part
Investigation of resistance force expression mechanism of pulled out reinforcement material by microfocus X-ray CT	Numerical approach on Belled piles uplift capacity evaluation
Seismic evaluation of two-span arch bridge on timber piles	Seismic reinforcement effect of soil improvement around group pile foundation in liquefiable ground
Seismic behavior of shallow overburden tunnel with pre-ground improvement	Investigation of mechanism of bearing capacity under vertical loading for pile supported in thin bearing layer

　　　　　

Study on mechanical behavior of soil

All civil structures are built on the ground. Therefore, when designing and constructing a civil structure, it is important how to evaluate the soil-structure interaction. The soil-structure interaction depends on the various factors, such as both rigid difference, nonlinearity, and the characteristics of external force. Accordingly, in order to comprehend these factors correctly, it is necessary to solve the mechanical behavior of soil and structures by sophisticated experiments and numerical analysis.
In recent years, furthermore, the design of civil structures has been made the shift to the performance based design from the specification based design, so we need to investigate not only the deformation and the damage but also the demand performance and the marginal state of structures. Based on the above-mentioned subject, we are carrying out research for various civil structures, such as a group pile foundation, a culvert tunnel, and a reinforced earth through the many experiments and numerical analysis to elucidate the soil-structures interaction and construct the rational design approach.

Investigation of failure mechanism of partially saturated soil by microfocus X-ray CT	Internal erosion and development of ground cavity around defected sewer pipes
Liquefaction analysis of river embankment Complex disaster of earthquake and rainfall	Undrained triaxial creep behavior of carbon dioxide hydrate bearing sand and its modeling
Consolidation of the soft ground using combination of vacuum consolidation method and embankment	Strength characteristics and transportability of high moisture mud treated by using fine powder from waste paper
Analysis on piping phenomenon at Kizu river levee by seepage-deformation coupled method

　　　　　

Technical approach for poverty reduction in developing countries from geotechnical engineering view point

A lot of developing countries suffer from poverty caused by poor infrastructure such as a farm road or a pond in the rural area, nevertheless these countries make a living by agriculture. In the rainy season, unpaved roads are impassable due to muddy conditions.
To solve this problem, our team developed road maintenance method with using “Sac” based on the policy that local people should solve the problem of developing country with simple method suitable for local site. Now our activities are expanding into various countries．